PROTECTION OF MOORING BUOYS. PART 7. RESULTS OF SIXTH RATING INSPECTION

Abstract
The report is the seventh of a series on the protection of mooring buoys. Fourteen test buoys were given their sixth rating for extent of coating deterioration, corrosion of steel, and fouling. A fifteenth buoy had been removed from testing at the time of the fourth inspection because of advanced deterioration. The coating system on four of the buoys were in good condition, those on nine others showed varying degrees of moderate deterioration, and one was in poor condition. Two sets of thirteen test panels each, coated with the different coating systems used on the buoys, were given their fifth rating inspection after 2-1/2 years of service. One set was exposed in San Diego Bay and the other in Port Hueneme Harbor. The condition of the coating systems on the Port Hueneme panels showed a general correlation with the test panels and buoys in San Diego. On buoys coated with antifouling paints, no detectable antifouling protection remained after 25 months, but on the test panels at both locations, two antifouling paints were still reducing fouling after 2-1/2 years. Three of the test buoys were cathodically protected with zinc anodes. The level of protection was high enough to mitigate rusting in the underwater portions of these buoys.

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